nginx启动之后，再启动tomcat。tomcat会报错

Question

我先启动nginx后，在启动tomcat，IDEA会有如下图所示提示，然后访问jsp页面访问不了。

然后如果我先启动tomcat，在启动nginx的时候,nginx会启动失败,start nginx后，进程列表里面没有nginx

这是我的nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    log_format  main  ' $remote_user [$time_local]  $http_x_Forwarded_for $remote_addr  $request '  
                      '$http_x_forwarded_for '  
                      '$upstream_addr '  
                      'ups_resp_time: $upstream_response_time '  
                      'request_time: $request_time';  

    access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       8081;
        server_name  localhost:8080;

        #charset koi8-r;

        access_log  logs/host.access.log  main;

        location / {
            proxy_pass http://localhost:8080/;
        }

        #location / {
         #   root   html;
         #   index  index.html index.htm;
        #}

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

刚刚那个问题解决了 目前遇到另一个问题
访问nginx8081向tomcat转发的时候 速度特别慢
F12看了一下


。。到40秒才开始Load页面，之前的都失败了，不知道为什么

Answer 1

出现了问题的话应该首先分析一下报的错，而不是直接就问，要培养分析能力以及解决问题的能力。像这个报错已经很明显了：翻译过来就是竞争端口，也就是不同的程序用了相同的端口了。

Answer 2

一般情况下端口不能被多个进程使用，Tomcat 使用了 8080 端口，nginx 就不行了。同理 nginx 先启动的话，已经把 8080 端口占用了，Tomcat 想使用这个端口是不行的。

解决办法就是 把 nginx 换监听成 80 端口：

server {
        listen       80;
        server_name  localhost;
        ......

也可以换 Tomcat 的端口，但是没必要。 nginx 作为前端的话应该用 80 ，Tomcat 随意。